Influence of Processing Parameter on Microstructure, Wear-resistance and Corrosion-resistance of Laser Cladding Ni-based Alloy on the Surface of 304 Stainless Steel
YANG Dan1, NING Yuheng2,3, ZHAO Yuguang2, ZHU Guobin2, XU Xiaofeng2
1 College of Engineering and Technology, Jilin Agricultural University,Changchun 130118; 2 Key Laboratory of Automobile Materials of Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025; 3 Datang Northeast Electric Power Test & Research Institute, Changchun 130012
Abstract: The effect of different processing parameter on the microstructure, wear-resistance and corrosion-resistance of laser cladding Ni-based alloy on the surface of 304 stainless steel was investigated. According to the analysis of the microstructure and mechanical properties, the optimized parameters were the laser power of 2.5 kW, the scanning speed of 4 mm/s and the powder feeding rate of 300 mg/s. The optimized parameters made the cladding layer smooth, and the cladding layer width was 14.36 mm, height was 1.612 mm, the depth of molten pool was 0.248 mm, and the dilution rate was 13.33. Moreover, the laser cladding made the hardness higher, and the average microhardness was 646.4HV, hence the abrasion loss was low. In addition, the corrosion resistance of cladding layer was improved, and the corrosion potential was of -286.77 mV. Under certain laser process parameters, the microstructure from the area to the cladding layer surface followed by planar crystal, the cellular crystal, columnar crystal, branches crystal and isometric crystal. Different laser power, scanning speed and feeding rate made the microstructure of cladding layer present certain regularity. With the increase of laser power, the microstructure gradually changed from fine to coarse. When scanning speed was improved, the microstructure became finer, and then turn coarse. Due to the increase of feeding rate, the microstructure gradually became finer. The wear resistance and corrosion resistance of the alloy were not only related to the size of the microstructure, but also closely related to the phase composition of the microstructure.
杨 丹,宁玉恒,赵宇光,朱国斌,徐晓峰. 工艺参数对304不锈钢表面激光熔覆Ni基合金涂层的组织、耐磨性及耐腐蚀性的影响[J]. 《材料导报》期刊社, 2017, 31(24): 133-140.
YANG Dan, NING Yuheng, ZHAO Yuguang, ZHU Guobin, XU Xiaofeng. Influence of Processing Parameter on Microstructure, Wear-resistance and Corrosion-resistance of Laser Cladding Ni-based Alloy on the Surface of 304 Stainless Steel. Materials Reports, 2017, 31(24): 133-140.
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2017, Vol. 31 
